Perennial dicotyledonous weeds of soybean agrocenoses of Primorsky Krai.

The presented work analyzes the results of studies of the weed component of soybean agrophytocenoses in the Primorsky Territory of the Russian Federation, conducted in the period from 2006 to 2023. A total of 82.5 thousand hectares of soybean crops were surveyed. The species composition of dicotyledonous perennial weed species has been determined, their distribution and abundance have been studied. A total of 39 perennial dicotyledonous weed species were discovered, belonging to 15 families and differing in the structure of the root system. The most common dicotyledonous perennial weed, often recorded in soybean fields of the Primorsky Territory, with a prevalence of 70 –100%, turned out to be Sonchus arvensis L., the average abundance of which was 7.7 pcs./m2. Also widespread, on 50–70% of the surveyed areas, were Cirsium setosum (Willd.) Bieb., Equisetum arvense L., Artemisia vulgaris L. and Artemisia rubripes Nakai. Rumex crispus L., Plantago uliginosa F.W. were present in soybean crops consistently, in all years of research, but with lower occurrence rates (20–50%). Schmidt, Taraxacum mongolicum Hand.- Mazz. and Stachys aspera Michx. A group of potentially dangerous weed species for crop production in the Primorsky Territory has been identified, which are consistently and large-scale expanding their presence in soybean crops - Potentilla anserina L., Lycopus lucidus Turcz. ex Benth. and Glycine soja Siebold et Zucc. [ABSTRACT FROM AUTHOR]